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My son who is now 16 no longer plays with his Lego sets. He would like to preserve some of his larger sets like Jabba the Hutts sail barge. Is there anything we can spray or paint on to hold them together? Or do we need to take it apart and glue it?

  • Having just completed after 8 hours a very complicated 8 to 14 year old building that my 4 year old grand son enjoys playing scenarios with the people, changing the appearance, rotating heads, I am a great fan of securing LEGO. So much of the kits available enable one to build an entire town, farm etc. but the people should never be glued. To date I have only glued one item, a floating speed boat he enjoys in his extended bath play. So yes you can stick a LEGO construction on a shelf. Boring. But I will definitely stop buying the older child versions for a 4 year old. Or not. – user6622 Dec 30 '15 at 9:04
  • I'm making a comment and not an answer because this is just a guess, but there is a technique the scale plastic modelers use: apply super-thin cyanoacrylate glue along the edges with a needle applicator and a steady hand. You use minute amounts of glue only along the edges where pieces meet, and capillary action sucks it in before hardening permanently. Whether you actually want to do this is another question answered below. – user3971 Dec 30 '15 at 13:36
  • I was actually looking for a way to glue lego too and was considering glue spray however wasn't sure if that will work or damage the legos. My child builds his own models every day and they are just fascinating. Except he pulls them apart and makes new ones all the time. I would like him to keep a collection of his creations while buying him new legos at the same time so he can continue to build. Wouldn't find gluing piece by piece as convenient - has anyone tried other strategies? – user7760 Oct 5 '16 at 1:16
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    @Acleverlegochild One of the key lessons in Lego for children is scarcity. Sometimes you have to make do with the pieces you have; this forces kids to come up with novel solutions to problems. Thus I'd recommend not buying more and more lego unless your kid's work is truly genius. Most people just take lots of pictures and post them on Flickr. – Mr. Shiny and New 安宇 Oct 5 '16 at 16:52
  • My son (4) and I love all the Star Wars sets and play with them, a lot! We go in to battle with ours. Glueing them would be perfect so there are definitely reasons for doing it. – Nag Mar 12 '17 at 20:43
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Although it can be done (I will share below), I would sincerely discoure you from gluing your LEGO sets. You will very much regret it later. Here are the reasons why: LEGO is meant to be a building toy - put together and taken apart many times. Once you glue a set it completely looses its usefulness and becomes nothing but another item to take up the shelf and collect dust.

LEGO has generational value. Your son may have lost interest now (very common in teen years), but may want to get back to the hobby later. He will definitely regret gluing his sets. Also, even if he doesn't get back to the hobby, if he will decide to have kids in the future, they will greatly appreciate having the opportunity to play and build with LEGO. Many LEGO fans inharited their LEGO sets from their parents and even grandparents. The long-term value of LEGO is truly amazing.

And this brings up the third point against gluing LEGO. The sets you mention have significant value that will only rise when the sets get retired. If your family ever gets into financial trouble and need to get some cash quickly, you can sell those LEGO sets - but not if they are glued.

I would encourage you to consider just boxing the sets (either built or taken apart) and just store them away carefully. It is really your best option that would keep both the value and the usefulness of the sets.

Having said that; if you still want to glue the sets, yes, you will need to take them apart and glue them. The most gentle glue that would not damage the LEGO elements too much but will hold the model together is simple white school-glue. You only need to add very little in between elements so the glue doesn't come out at the edges.

Another option is to just wrap the whole set in thin plastic sheet (the kind used for wrapping food). This is more for storage and moving the set around, but the tight-fitting plastic prevents the set from falling apart.

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    This post is 100% right re the generational thing. I have sets from 20+ years ago that my 2.5 year old son and I are playing with right now. – mj_ Sep 16 '13 at 14:37
  • -1. The answer to a viable how-to should never be "don't", especially not for reasons the asker may not care about. – Weckar E. Oct 31 '17 at 10:22
  • Both myself and others have listed options for gluing and similar methods. I added reasons not to glue LEGO, because OP may have not considered them, and so many people regret the decision later. If OP truly didn't care, he/she would have probably mentioned that in the original question. It's better to be safe and provide additional information, then omit important considerations that OP might find helpful in weighting the pros and cons of their decision. However I do agree that I could have listed the options in a different order for a better answer. I will keep that in mind for the future. – TheBrickBlogger Oct 31 '17 at 21:41
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A better way to preserve LEGO is to put it in some sort of display case. It maintains the value and keeps the dust off.

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Full disclosure, I invented this product so I am bias. But it works, and I've used it on my own Legos.

I know this was posted in 2013, but if anyone is still looking for a solution on how to temporarily bond your Lego creations together try Spray and Play.

http://www.sprayandplaytoys.com/

Spray and Play is a water soluble (you can wash it off), ASTM non-toxic (safe for kids), aerosol adhesive. You build your set, spray on the adhesive, and wait a few hours. We've found that removing parts that you want to move (cockpits/ladders) before you spray works best. Once dry, your set will be covered by a thin, invisible, coat that holds all the pieces together. In a tensile test we found it improved the strength between two 2x4 bricks by 60%.

Fear not if you want to reuse the Legos for another build or pass them down for your kids. Our adhesive is water soluble and will come off with soap and water. I still have a giant bin of mixed Legos from when I was a kid, and would hate to have anything bond permanently, so I understand. But I also want to show of my Millennium Falcon without fear of it being destroyed, damaged, or dinged; so that's why I developed Spray and Play.

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Use MEK (Methyl ethyl ketone). Can buy it in hardware or auto body shop supplies. In auto body work it is used to degrease and clean adhesives off surfaces. It is also a major component of ABS plastic cement, which you can also use but it's messier. You can also put a bit of MEK in a glass jar and then throw in old lego pieces to create a filler and cementer. But that is a rare thing to need.

I use an eye dropper bottle (glass of course) or glass syringe to glue parts together. You MUST be in a well ventilated area, and I mean well ventilated. MEK melts plastic so put the pieces together before it evaporates. If your eyes are near MEK they will be bloodshot, so have a fan or do this outside, like I do. Also wear those cool blue non latex gloves to protect your hands.

I use MEK to glue major structures together that fall apart - like supports. In tall structures I will glue the structure into two halves so that they can be stored partially unassembled, and then put back together. It is also useful to glue things like space shuttle parts that continually fall off when played with. I never glue all of the pieces, just the major parts that support the toy, that way it can still be disassembled.

MEK works great and I love how it keeps builds together that would otherwise be lost forever in masses of parts stored in bins and tubs.

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I have Lego sets that have been on display for years, including the relatively fragile AT-AT from 2003. It has stood, fully assembled and almost never touched, since I first got it in late 2003/early 2004. In all that time it's gotten dusty, so I've used various things to clean it: a vacuum with a brush (if you're sure there are no loose parts), a can of compressed air, and a sink of soapy water. You can submerge this whole model, or take parts of it apart, and wash the dust off, in a few minutes.

At the end of the day, it is still in near-perfect condition, because it's never played with and just sits there. I never, ever, wish it had been glued. Why would it need gluing? I can always put it back together if anything falls off. The lego pieces hold themselves together just fine.

There are two areas where its preservation is lacking: First and foremost, sunlight. Sunlight changes the colour of the bricks. I keep this one out of direct sun and it hasn't yellowed too much. But the light-grey pieces are particularly prone to discolouration and I'm sure the outer shell of the model has changed colour somewhat. The only thing that would have helped is UV-protection.

Second, some of the technic pins that hold it together have weakened over the years. These can be easily replaced if they become a problem.

Otherwise, this model has stood as a display piece for 10 years now, but if I wanted to, I could disassemble it and use all its pieces in a new creation.

I offer this as evidence that you do not need to glue models, and as TheBrickBlogger wrote, while it's possible, I would discourage it. It doesn't "preserve" the model in any useful sense, except keeping it together so that no pieces get lost or missing. If the model isn't going to be moved around a lot, or played with, nothing will fall off. And if something does fall off, it can easily be put back.

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